As per Gareth's comment ...
Published by John Salonich, Vice President / Managing Director
As per Gareth's comment below, footprint is a major factor in selection of a technology. If you have land available then the low OPEX cost of a constructed wetland and reed bed system will work in developing countries with limited energy to power conventional MBBR or SBR designs. Engineered wetlands (wastewater) and reed bed (sludge) provide an ideal solution where pristine effluent is desired and a biosolids is created that has beneficial reuse for agricultural activities.